I've never had a player with Dribbler SA before, so will see whether it is have decent or not, especially as I tend to focus down the wings a lot. Hoping it makes him 'Messiesque' in that he will have a better chance of beating his man if man marked at least.
To against what other people have had, my scout players available have been has been pretty good so far. Two positions that strengthened my team, both 22 years old, both Q54, both 6-7 SP away from 7* and both with, I hope, useful SA's (Corner for the DR/DC and Dribbler for the MR).
Going back to your Dribbler being 'mediocre', I still think people underestimate the usefulness of the Corner Taker SA, as I have scored a fair few goals from corners because of this.